What causes grey smoke, going up hill, accelerating and going down hill, also obviously when changing down or up. Not black, not white, nice shade of grey, exhausts are also grey inside.
List the possibilities please, starting at cheapest and easiest
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Only joking re cheapest and easiest, well not really, oh well, you know what I mean.
List the possibilities please, starting at cheapest and easiest
Only joking re cheapest and easiest, well not really, oh well, you know what I mean.